Abstract
The trimorphic Li 2MnBr 4 has been studied by neutron powder diffraction and differential scanning calorimetry (DSC) in order to prove the nature of the high lithium ion conductivity of this compound. The room temperature polymorph ( oI 28) crystallizes in a hitherto unknown ordered NaCl defect structure, whilst the high-temperature phases exhibit a modified Zr 3S 4 (space group Fd3m, z = 8) and a disordered deficient NaCl type structure, respectively. The structural data of the high temperature polymorphs at 350 and 500 °C are communicated (a = 1123.72(5) and 567.31(7) pm, u = 0.2540(3) (HTM I), R I - 4.41 and 4.26 %, respectively). The phase transitions at 545 K (first order) and 758 K (second order) (heat of transition 3 and 2.7 J g −1, entropy changes 2 and 1.4 J mol −1 K −1) and the ionic conductivities (as compared to the larger ones of Li 2MnCl 4) are discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
